Dearest Blue is a hardcore hentai OVA series produced by PoRO, adapting a dark NTR storyline from LiLiM DARKNESS's "Blue" visual novel series. It follows cool, tsundere student council president and childhood friend Rio (Ryo), who rises to fame as an idol, only to become entangled in a sinister game orchestrated by powerful men. Her loyal childhood friend Mamoru watches helplessly as she is manipulated, exploited, and corrupted through intense sexual encounters in offices, dressing rooms, and beyond—turning her from a proud idol into a submissive "hamedoru" (sex idol).

 In Dearest Blue, childhood sweethearts Rio and Mamoru share unspoken feelings, but their innocent bond shatters when Rio wins a beauty contest and skyrockets to idol stardom. Behind the glamour, corrupt agency figures and influential sponsors treat her as the ultimate prize in a twisted game of dominance and corruption. Rio, once aloof and strong-willed, faces relentless sexual coercion, blackmail, and gang exploitation while pursuing her career. Mamoru, assigned as her bodyguard, can only stand by in agony as his dearest friend is defiled right before his eyes—bound, humiliated, and gradually broken into submission. The series masterfully blends heart-wrenching NTR (netorare) despair with explicit, hardcore scenes: blowjobs, anal, creampies, bondage, and public degradation. PoRO's animation delivers juicy, detailed eroticism alongside the emotional torment of watching an idol fall from grace. This "depressing erection" title excels in mixing cute idol aesthetics with brutal corruption, pushing viewers to the edge of painful excitement as Rio transforms from a defiant beauty into a compliant sex toy. Perfect for fans of heavy NTR, idol themes, and psychological degradation in hentai.